[PD] compiling pix_opencv on debian (lmde)

[yvan volochine]

FYI it does not build on archlinux (with opencv2).

I fixed some of it with the following patch:
https://gist.github.com/gusano/5814205

and now all externals build fine except for `pix_opencv_blobtrack` which 
gives the following error:


blobtrack.h: In function ‘CvFGDetector* cvCreateFGDetector1()’:
blobtrack.h:20:113: warning: control reaches end of non-void function 
[-Wreturn-type]
  static CvFGDetector* cvCreateFGDetector1      () { return 
cvCreateFGDetectorBase(CV_BG_MODEL_MOG,        NULL); }
 
                                           ^
blobtrack.h: In function ‘CvFGDetector* cvCreateFGDetector0Simple()’:
blobtrack.h:19:113: warning: control reaches end of non-void function 
[-Wreturn-type]
  static CvFGDetector* cvCreateFGDetector0Simple() { return 
cvCreateFGDetectorBase(CV_BG_MODEL_FGD_SIMPLE, NULL); }
 
                                           ^
blobtrack.h: In function ‘CvFGDetector* cvCreateFGDetector0()’:
blobtrack.h:18:113: warning: control reaches end of non-void function 
[-Wreturn-type]
  static CvFGDetector* cvCreateFGDetector0      () { return 
cvCreateFGDetectorBase(CV_BG_MODEL_FGD,        NULL); }
 
                                           ^
make: *** [pix_opencv_blobtrack.o] Error 1


ciao,
y

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